I have made up a couple of games I've seen at shows.
Pushrod drop, where you have a series of different size holes & you try to drop a pushrod from a certain height.
Timing chain toss, took a cam & the gear bolted together , stood it up & had to toss the timing chains over it.
Ring toss, had some BIGGG rings off of a big bore motor & put a push rod on a board & then you tossed the rings onto the pushrod.
Piston throw, got different size pistons from a weed eater to a big bore diesel motor & set up tires at different distances & you throw the piston into the tires.
hope these help you.............joe